WASHINGTON — President Obama will jump head-first into the next crucial budget battle with a speech this week about deficit reduction — but Republicans yesterday charged he doesn’t have much credibility on the topic.

“We’ve had to bring this president kicking and screaming to the table to cut spending,” House Majority Leader Eric Cantor (R-Va.) said on “Fox News Sunday.”

“It’s really hard to believe what this president is saying,” Cantor said.

Obama is expected to deliver his speech on long-term spending cuts Wednesday